Now this didn't happen on previous arch images. At first I thought it was badly burned iso, but the same problem occured with newly burned one (downloaded from another mirror). It seems to be a problem with I2C bus, but my knowledge ends at this point.

[UPDATE]It did start, after several attempts, but the keyboard stopped responding. I forced it to restart only to halt with above error.

Re: archiso booting fails on xps15z

Hello,

i don't think that "i915.semaphores=1" will change anything since i915 is for Intel graphics cards, but it looks like this computer has an Nvidia graphics card. I suggest trying to blacklist the "nouveau" kernel module in the bootloader (syslinux) by changing the kernel command line, however i have no idea on how to do that, i read somewhere (it was Ubuntu-related so i don't know if it will work on Arch) that you can add "module.blacklist=1" to the kernel command line (in the bootloader, press TAB to edit the command line and use Enter to boot), in your case it should be "nouveau.blacklist=1".